Don Newton | 379ae25 | 2019-04-01 12:17:06 -0400 | [diff] [blame^] | 1 | // Copyright (C) MongoDB, Inc. 2017-present. |
| 2 | // |
| 3 | // Licensed under the Apache License, Version 2.0 (the "License"); you may |
| 4 | // not use this file except in compliance with the License. You may obtain |
| 5 | // a copy of the License at http://www.apache.org/licenses/LICENSE-2.0 |
| 6 | |
| 7 | package command |
| 8 | |
| 9 | import ( |
| 10 | "errors" |
| 11 | |
| 12 | "context" |
| 13 | |
| 14 | "fmt" |
| 15 | |
| 16 | "github.com/mongodb/mongo-go-driver/bson" |
| 17 | "github.com/mongodb/mongo-go-driver/bson/bsontype" |
| 18 | "github.com/mongodb/mongo-go-driver/bson/primitive" |
| 19 | "github.com/mongodb/mongo-go-driver/mongo/readconcern" |
| 20 | "github.com/mongodb/mongo-go-driver/mongo/writeconcern" |
| 21 | "github.com/mongodb/mongo-go-driver/x/bsonx" |
| 22 | "github.com/mongodb/mongo-go-driver/x/bsonx/bsoncore" |
| 23 | "github.com/mongodb/mongo-go-driver/x/mongo/driver/session" |
| 24 | "github.com/mongodb/mongo-go-driver/x/network/description" |
| 25 | "github.com/mongodb/mongo-go-driver/x/network/result" |
| 26 | "github.com/mongodb/mongo-go-driver/x/network/wiremessage" |
| 27 | ) |
| 28 | |
| 29 | // WriteBatch represents a single batch for a write operation. |
| 30 | type WriteBatch struct { |
| 31 | *Write |
| 32 | numDocs int |
| 33 | } |
| 34 | |
| 35 | // DecodeError attempts to decode the wiremessage as an error |
| 36 | func DecodeError(wm wiremessage.WireMessage) error { |
| 37 | var rdr bson.Raw |
| 38 | switch msg := wm.(type) { |
| 39 | case wiremessage.Msg: |
| 40 | for _, section := range msg.Sections { |
| 41 | switch converted := section.(type) { |
| 42 | case wiremessage.SectionBody: |
| 43 | rdr = converted.Document |
| 44 | } |
| 45 | } |
| 46 | case wiremessage.Reply: |
| 47 | if msg.ResponseFlags&wiremessage.QueryFailure != wiremessage.QueryFailure { |
| 48 | return nil |
| 49 | } |
| 50 | rdr = msg.Documents[0] |
| 51 | } |
| 52 | |
| 53 | err := rdr.Validate() |
| 54 | if err != nil { |
| 55 | return nil |
| 56 | } |
| 57 | |
| 58 | extractedError := extractError(rdr) |
| 59 | |
| 60 | // If parsed successfully return the error |
| 61 | if _, ok := extractedError.(Error); ok { |
| 62 | return err |
| 63 | } |
| 64 | |
| 65 | return nil |
| 66 | } |
| 67 | |
| 68 | // helper method to extract an error from a reader if there is one; first returned item is the |
| 69 | // error if it exists, the second holds parsing errors |
| 70 | func extractError(rdr bson.Raw) error { |
| 71 | var errmsg, codeName string |
| 72 | var code int32 |
| 73 | var labels []string |
| 74 | elems, err := rdr.Elements() |
| 75 | if err != nil { |
| 76 | return err |
| 77 | } |
| 78 | |
| 79 | for _, elem := range elems { |
| 80 | switch elem.Key() { |
| 81 | case "ok": |
| 82 | switch elem.Value().Type { |
| 83 | case bson.TypeInt32: |
| 84 | if elem.Value().Int32() == 1 { |
| 85 | return nil |
| 86 | } |
| 87 | case bson.TypeInt64: |
| 88 | if elem.Value().Int64() == 1 { |
| 89 | return nil |
| 90 | } |
| 91 | case bson.TypeDouble: |
| 92 | if elem.Value().Double() == 1 { |
| 93 | return nil |
| 94 | } |
| 95 | } |
| 96 | case "errmsg": |
| 97 | if str, okay := elem.Value().StringValueOK(); okay { |
| 98 | errmsg = str |
| 99 | } |
| 100 | case "codeName": |
| 101 | if str, okay := elem.Value().StringValueOK(); okay { |
| 102 | codeName = str |
| 103 | } |
| 104 | case "code": |
| 105 | if c, okay := elem.Value().Int32OK(); okay { |
| 106 | code = c |
| 107 | } |
| 108 | case "errorLabels": |
| 109 | if arr, okay := elem.Value().ArrayOK(); okay { |
| 110 | elems, err := arr.Elements() |
| 111 | if err != nil { |
| 112 | continue |
| 113 | } |
| 114 | for _, elem := range elems { |
| 115 | if str, ok := elem.Value().StringValueOK(); ok { |
| 116 | labels = append(labels, str) |
| 117 | } |
| 118 | } |
| 119 | |
| 120 | } |
| 121 | } |
| 122 | } |
| 123 | |
| 124 | if errmsg == "" { |
| 125 | errmsg = "command failed" |
| 126 | } |
| 127 | |
| 128 | return Error{ |
| 129 | Code: code, |
| 130 | Message: errmsg, |
| 131 | Name: codeName, |
| 132 | Labels: labels, |
| 133 | } |
| 134 | } |
| 135 | |
| 136 | func responseClusterTime(response bson.Raw) bson.Raw { |
| 137 | clusterTime, err := response.LookupErr("$clusterTime") |
| 138 | if err != nil { |
| 139 | // $clusterTime not included by the server |
| 140 | return nil |
| 141 | } |
| 142 | idx, doc := bsoncore.AppendDocumentStart(nil) |
| 143 | doc = bsoncore.AppendHeader(doc, clusterTime.Type, "$clusterTime") |
| 144 | doc = append(doc, clusterTime.Value...) |
| 145 | doc, _ = bsoncore.AppendDocumentEnd(doc, idx) |
| 146 | return doc |
| 147 | } |
| 148 | |
| 149 | func updateClusterTimes(sess *session.Client, clock *session.ClusterClock, response bson.Raw) error { |
| 150 | clusterTime := responseClusterTime(response) |
| 151 | if clusterTime == nil { |
| 152 | return nil |
| 153 | } |
| 154 | |
| 155 | if sess != nil { |
| 156 | err := sess.AdvanceClusterTime(clusterTime) |
| 157 | if err != nil { |
| 158 | return err |
| 159 | } |
| 160 | } |
| 161 | |
| 162 | if clock != nil { |
| 163 | clock.AdvanceClusterTime(clusterTime) |
| 164 | } |
| 165 | |
| 166 | return nil |
| 167 | } |
| 168 | |
| 169 | func updateOperationTime(sess *session.Client, response bson.Raw) error { |
| 170 | if sess == nil { |
| 171 | return nil |
| 172 | } |
| 173 | |
| 174 | opTimeElem, err := response.LookupErr("operationTime") |
| 175 | if err != nil { |
| 176 | // operationTime not included by the server |
| 177 | return nil |
| 178 | } |
| 179 | |
| 180 | t, i := opTimeElem.Timestamp() |
| 181 | return sess.AdvanceOperationTime(&primitive.Timestamp{ |
| 182 | T: t, |
| 183 | I: i, |
| 184 | }) |
| 185 | } |
| 186 | |
| 187 | func marshalCommand(cmd bsonx.Doc) (bson.Raw, error) { |
| 188 | if cmd == nil { |
| 189 | return bson.Raw{5, 0, 0, 0, 0}, nil |
| 190 | } |
| 191 | |
| 192 | return cmd.MarshalBSON() |
| 193 | } |
| 194 | |
| 195 | // adds session related fields to a BSON doc representing a command |
| 196 | func addSessionFields(cmd bsonx.Doc, desc description.SelectedServer, client *session.Client) (bsonx.Doc, error) { |
| 197 | if client == nil || !description.SessionsSupported(desc.WireVersion) || desc.SessionTimeoutMinutes == 0 { |
| 198 | return cmd, nil |
| 199 | } |
| 200 | |
| 201 | if client.Terminated { |
| 202 | return cmd, session.ErrSessionEnded |
| 203 | } |
| 204 | |
| 205 | if _, err := cmd.LookupElementErr("lsid"); err != nil { |
| 206 | cmd = cmd.Delete("lsid") |
| 207 | } |
| 208 | |
| 209 | cmd = append(cmd, bsonx.Elem{"lsid", bsonx.Document(client.SessionID)}) |
| 210 | |
| 211 | if client.TransactionRunning() || |
| 212 | client.RetryingCommit { |
| 213 | cmd = addTransaction(cmd, client) |
| 214 | } |
| 215 | |
| 216 | client.ApplyCommand() // advance the state machine based on a command executing |
| 217 | |
| 218 | return cmd, nil |
| 219 | } |
| 220 | |
| 221 | // if in a transaction, add the transaction fields |
| 222 | func addTransaction(cmd bsonx.Doc, client *session.Client) bsonx.Doc { |
| 223 | cmd = append(cmd, bsonx.Elem{"txnNumber", bsonx.Int64(client.TxnNumber)}) |
| 224 | if client.TransactionStarting() { |
| 225 | // When starting transaction, always transition to the next state, even on error |
| 226 | cmd = append(cmd, bsonx.Elem{"startTransaction", bsonx.Boolean(true)}) |
| 227 | } |
| 228 | return append(cmd, bsonx.Elem{"autocommit", bsonx.Boolean(false)}) |
| 229 | } |
| 230 | |
| 231 | func addClusterTime(cmd bsonx.Doc, desc description.SelectedServer, sess *session.Client, clock *session.ClusterClock) bsonx.Doc { |
| 232 | if (clock == nil && sess == nil) || !description.SessionsSupported(desc.WireVersion) { |
| 233 | return cmd |
| 234 | } |
| 235 | |
| 236 | var clusterTime bson.Raw |
| 237 | if clock != nil { |
| 238 | clusterTime = clock.GetClusterTime() |
| 239 | } |
| 240 | |
| 241 | if sess != nil { |
| 242 | if clusterTime == nil { |
| 243 | clusterTime = sess.ClusterTime |
| 244 | } else { |
| 245 | clusterTime = session.MaxClusterTime(clusterTime, sess.ClusterTime) |
| 246 | } |
| 247 | } |
| 248 | |
| 249 | if clusterTime == nil { |
| 250 | return cmd |
| 251 | } |
| 252 | |
| 253 | d, err := bsonx.ReadDoc(clusterTime) |
| 254 | if err != nil { |
| 255 | return cmd // broken clusterTime |
| 256 | } |
| 257 | |
| 258 | cmd = cmd.Delete("$clusterTime") |
| 259 | |
| 260 | return append(cmd, d...) |
| 261 | } |
| 262 | |
| 263 | // add a read concern to a BSON doc representing a command |
| 264 | func addReadConcern(cmd bsonx.Doc, desc description.SelectedServer, rc *readconcern.ReadConcern, sess *session.Client) (bsonx.Doc, error) { |
| 265 | // Starting transaction's read concern overrides all others |
| 266 | if sess != nil && sess.TransactionStarting() && sess.CurrentRc != nil { |
| 267 | rc = sess.CurrentRc |
| 268 | } |
| 269 | |
| 270 | // start transaction must append afterclustertime IF causally consistent and operation time exists |
| 271 | if rc == nil && sess != nil && sess.TransactionStarting() && sess.Consistent && sess.OperationTime != nil { |
| 272 | rc = readconcern.New() |
| 273 | } |
| 274 | |
| 275 | if rc == nil { |
| 276 | return cmd, nil |
| 277 | } |
| 278 | |
| 279 | t, data, err := rc.MarshalBSONValue() |
| 280 | if err != nil { |
| 281 | return cmd, err |
| 282 | } |
| 283 | |
| 284 | var rcDoc bsonx.Doc |
| 285 | err = rcDoc.UnmarshalBSONValue(t, data) |
| 286 | if err != nil { |
| 287 | return cmd, err |
| 288 | } |
| 289 | if description.SessionsSupported(desc.WireVersion) && sess != nil && sess.Consistent && sess.OperationTime != nil { |
| 290 | rcDoc = append(rcDoc, bsonx.Elem{"afterClusterTime", bsonx.Timestamp(sess.OperationTime.T, sess.OperationTime.I)}) |
| 291 | } |
| 292 | |
| 293 | cmd = cmd.Delete("readConcern") |
| 294 | |
| 295 | if len(rcDoc) != 0 { |
| 296 | cmd = append(cmd, bsonx.Elem{"readConcern", bsonx.Document(rcDoc)}) |
| 297 | } |
| 298 | return cmd, nil |
| 299 | } |
| 300 | |
| 301 | // add a write concern to a BSON doc representing a command |
| 302 | func addWriteConcern(cmd bsonx.Doc, wc *writeconcern.WriteConcern) (bsonx.Doc, error) { |
| 303 | if wc == nil { |
| 304 | return cmd, nil |
| 305 | } |
| 306 | |
| 307 | t, data, err := wc.MarshalBSONValue() |
| 308 | if err != nil { |
| 309 | if err == writeconcern.ErrEmptyWriteConcern { |
| 310 | return cmd, nil |
| 311 | } |
| 312 | return cmd, err |
| 313 | } |
| 314 | |
| 315 | var xval bsonx.Val |
| 316 | err = xval.UnmarshalBSONValue(t, data) |
| 317 | if err != nil { |
| 318 | return cmd, err |
| 319 | } |
| 320 | |
| 321 | // delete if doc already has write concern |
| 322 | cmd = cmd.Delete("writeConcern") |
| 323 | |
| 324 | return append(cmd, bsonx.Elem{Key: "writeConcern", Value: xval}), nil |
| 325 | } |
| 326 | |
| 327 | // Get the error labels from a command response |
| 328 | func getErrorLabels(rdr *bson.Raw) ([]string, error) { |
| 329 | var labels []string |
| 330 | labelsElem, err := rdr.LookupErr("errorLabels") |
| 331 | if err != bsoncore.ErrElementNotFound { |
| 332 | return nil, err |
| 333 | } |
| 334 | if labelsElem.Type == bsontype.Array { |
| 335 | labelsIt, err := labelsElem.Array().Elements() |
| 336 | if err != nil { |
| 337 | return nil, err |
| 338 | } |
| 339 | for _, elem := range labelsIt { |
| 340 | labels = append(labels, elem.Value().StringValue()) |
| 341 | } |
| 342 | } |
| 343 | return labels, nil |
| 344 | } |
| 345 | |
| 346 | // Remove command arguments for insert, update, and delete commands from the BSON document so they can be encoded |
| 347 | // as a Section 1 payload in OP_MSG |
| 348 | func opmsgRemoveArray(cmd bsonx.Doc) (bsonx.Doc, bsonx.Arr, string) { |
| 349 | var array bsonx.Arr |
| 350 | var id string |
| 351 | |
| 352 | keys := []string{"documents", "updates", "deletes"} |
| 353 | |
| 354 | for _, key := range keys { |
| 355 | val, err := cmd.LookupErr(key) |
| 356 | if err != nil { |
| 357 | continue |
| 358 | } |
| 359 | |
| 360 | array = val.Array() |
| 361 | cmd = cmd.Delete(key) |
| 362 | id = key |
| 363 | break |
| 364 | } |
| 365 | |
| 366 | return cmd, array, id |
| 367 | } |
| 368 | |
| 369 | // Add the $db and $readPreference keys to the command |
| 370 | // If the command has no read preference, pass nil for rpDoc |
| 371 | func opmsgAddGlobals(cmd bsonx.Doc, dbName string, rpDoc bsonx.Doc) (bson.Raw, error) { |
| 372 | cmd = append(cmd, bsonx.Elem{"$db", bsonx.String(dbName)}) |
| 373 | if rpDoc != nil { |
| 374 | cmd = append(cmd, bsonx.Elem{"$readPreference", bsonx.Document(rpDoc)}) |
| 375 | } |
| 376 | |
| 377 | return cmd.MarshalBSON() // bsonx.Doc.MarshalBSON never returns an error. |
| 378 | } |
| 379 | |
| 380 | func opmsgCreateDocSequence(arr bsonx.Arr, identifier string) (wiremessage.SectionDocumentSequence, error) { |
| 381 | docSequence := wiremessage.SectionDocumentSequence{ |
| 382 | PayloadType: wiremessage.DocumentSequence, |
| 383 | Identifier: identifier, |
| 384 | Documents: make([]bson.Raw, 0, len(arr)), |
| 385 | } |
| 386 | |
| 387 | for _, val := range arr { |
| 388 | d, _ := val.Document().MarshalBSON() |
| 389 | docSequence.Documents = append(docSequence.Documents, d) |
| 390 | } |
| 391 | |
| 392 | docSequence.Size = int32(docSequence.PayloadLen()) |
| 393 | return docSequence, nil |
| 394 | } |
| 395 | |
| 396 | func splitBatches(docs []bsonx.Doc, maxCount, targetBatchSize int) ([][]bsonx.Doc, error) { |
| 397 | batches := [][]bsonx.Doc{} |
| 398 | |
| 399 | if targetBatchSize > reservedCommandBufferBytes { |
| 400 | targetBatchSize -= reservedCommandBufferBytes |
| 401 | } |
| 402 | |
| 403 | if maxCount <= 0 { |
| 404 | maxCount = 1 |
| 405 | } |
| 406 | |
| 407 | startAt := 0 |
| 408 | splitInserts: |
| 409 | for { |
| 410 | size := 0 |
| 411 | batch := []bsonx.Doc{} |
| 412 | assembleBatch: |
| 413 | for idx := startAt; idx < len(docs); idx++ { |
| 414 | raw, _ := docs[idx].MarshalBSON() |
| 415 | |
| 416 | if len(raw) > targetBatchSize { |
| 417 | return nil, ErrDocumentTooLarge |
| 418 | } |
| 419 | if size+len(raw) > targetBatchSize { |
| 420 | break assembleBatch |
| 421 | } |
| 422 | |
| 423 | size += len(raw) |
| 424 | batch = append(batch, docs[idx]) |
| 425 | startAt++ |
| 426 | if len(batch) == maxCount { |
| 427 | break assembleBatch |
| 428 | } |
| 429 | } |
| 430 | batches = append(batches, batch) |
| 431 | if startAt == len(docs) { |
| 432 | break splitInserts |
| 433 | } |
| 434 | } |
| 435 | |
| 436 | return batches, nil |
| 437 | } |
| 438 | |
| 439 | func encodeBatch( |
| 440 | docs []bsonx.Doc, |
| 441 | opts []bsonx.Elem, |
| 442 | cmdKind WriteCommandKind, |
| 443 | collName string, |
| 444 | ) (bsonx.Doc, error) { |
| 445 | var cmdName string |
| 446 | var docString string |
| 447 | |
| 448 | switch cmdKind { |
| 449 | case InsertCommand: |
| 450 | cmdName = "insert" |
| 451 | docString = "documents" |
| 452 | case UpdateCommand: |
| 453 | cmdName = "update" |
| 454 | docString = "updates" |
| 455 | case DeleteCommand: |
| 456 | cmdName = "delete" |
| 457 | docString = "deletes" |
| 458 | } |
| 459 | |
| 460 | cmd := bsonx.Doc{{cmdName, bsonx.String(collName)}} |
| 461 | |
| 462 | vals := make(bsonx.Arr, 0, len(docs)) |
| 463 | for _, doc := range docs { |
| 464 | vals = append(vals, bsonx.Document(doc)) |
| 465 | } |
| 466 | cmd = append(cmd, bsonx.Elem{docString, bsonx.Array(vals)}) |
| 467 | cmd = append(cmd, opts...) |
| 468 | |
| 469 | return cmd, nil |
| 470 | } |
| 471 | |
| 472 | // converts batches of Write Commands to wire messages |
| 473 | func batchesToWireMessage(batches []*WriteBatch, desc description.SelectedServer) ([]wiremessage.WireMessage, error) { |
| 474 | wms := make([]wiremessage.WireMessage, len(batches)) |
| 475 | for _, cmd := range batches { |
| 476 | wm, err := cmd.Encode(desc) |
| 477 | if err != nil { |
| 478 | return nil, err |
| 479 | } |
| 480 | |
| 481 | wms = append(wms, wm) |
| 482 | } |
| 483 | |
| 484 | return wms, nil |
| 485 | } |
| 486 | |
| 487 | // Roundtrips the write batches, returning the result structs (as interface), |
| 488 | // the write batches that weren't round tripped and any errors |
| 489 | func roundTripBatches( |
| 490 | ctx context.Context, |
| 491 | desc description.SelectedServer, |
| 492 | rw wiremessage.ReadWriter, |
| 493 | batches []*WriteBatch, |
| 494 | continueOnError bool, |
| 495 | sess *session.Client, |
| 496 | cmdKind WriteCommandKind, |
| 497 | ) (interface{}, []*WriteBatch, error) { |
| 498 | var res interface{} |
| 499 | var upsertIndex int64 // the operation index for the upserted IDs map |
| 500 | |
| 501 | // hold onto txnNumber, reset it when loop exits to ensure reuse of same |
| 502 | // transaction number if retry is needed |
| 503 | var txnNumber int64 |
| 504 | if sess != nil && sess.RetryWrite { |
| 505 | txnNumber = sess.TxnNumber |
| 506 | } |
| 507 | for j, cmd := range batches { |
| 508 | rdr, err := cmd.RoundTrip(ctx, desc, rw) |
| 509 | if err != nil { |
| 510 | if sess != nil && sess.RetryWrite { |
| 511 | sess.TxnNumber = txnNumber + int64(j) |
| 512 | } |
| 513 | return res, batches, err |
| 514 | } |
| 515 | |
| 516 | // TODO can probably DRY up this code |
| 517 | switch cmdKind { |
| 518 | case InsertCommand: |
| 519 | if res == nil { |
| 520 | res = result.Insert{} |
| 521 | } |
| 522 | |
| 523 | conv, _ := res.(result.Insert) |
| 524 | insertCmd := &Insert{} |
| 525 | r, err := insertCmd.decode(desc, rdr).Result() |
| 526 | if err != nil { |
| 527 | return res, batches, err |
| 528 | } |
| 529 | |
| 530 | conv.WriteErrors = append(conv.WriteErrors, r.WriteErrors...) |
| 531 | |
| 532 | if r.WriteConcernError != nil { |
| 533 | conv.WriteConcernError = r.WriteConcernError |
| 534 | if sess != nil && sess.RetryWrite { |
| 535 | sess.TxnNumber = txnNumber |
| 536 | return conv, batches, nil // report writeconcernerror for retry |
| 537 | } |
| 538 | } |
| 539 | |
| 540 | conv.N += r.N |
| 541 | |
| 542 | if !continueOnError && len(conv.WriteErrors) > 0 { |
| 543 | return conv, batches, nil |
| 544 | } |
| 545 | |
| 546 | res = conv |
| 547 | case UpdateCommand: |
| 548 | if res == nil { |
| 549 | res = result.Update{} |
| 550 | } |
| 551 | |
| 552 | conv, _ := res.(result.Update) |
| 553 | updateCmd := &Update{} |
| 554 | r, err := updateCmd.decode(desc, rdr).Result() |
| 555 | if err != nil { |
| 556 | return conv, batches, err |
| 557 | } |
| 558 | |
| 559 | conv.WriteErrors = append(conv.WriteErrors, r.WriteErrors...) |
| 560 | |
| 561 | if r.WriteConcernError != nil { |
| 562 | conv.WriteConcernError = r.WriteConcernError |
| 563 | if sess != nil && sess.RetryWrite { |
| 564 | sess.TxnNumber = txnNumber |
| 565 | return conv, batches, nil // report writeconcernerror for retry |
| 566 | } |
| 567 | } |
| 568 | |
| 569 | conv.MatchedCount += r.MatchedCount |
| 570 | conv.ModifiedCount += r.ModifiedCount |
| 571 | for _, upsert := range r.Upserted { |
| 572 | conv.Upserted = append(conv.Upserted, result.Upsert{ |
| 573 | Index: upsert.Index + upsertIndex, |
| 574 | ID: upsert.ID, |
| 575 | }) |
| 576 | } |
| 577 | |
| 578 | if !continueOnError && len(conv.WriteErrors) > 0 { |
| 579 | return conv, batches, nil |
| 580 | } |
| 581 | |
| 582 | res = conv |
| 583 | upsertIndex += int64(cmd.numDocs) |
| 584 | case DeleteCommand: |
| 585 | if res == nil { |
| 586 | res = result.Delete{} |
| 587 | } |
| 588 | |
| 589 | conv, _ := res.(result.Delete) |
| 590 | deleteCmd := &Delete{} |
| 591 | r, err := deleteCmd.decode(desc, rdr).Result() |
| 592 | if err != nil { |
| 593 | return conv, batches, err |
| 594 | } |
| 595 | |
| 596 | conv.WriteErrors = append(conv.WriteErrors, r.WriteErrors...) |
| 597 | |
| 598 | if r.WriteConcernError != nil { |
| 599 | conv.WriteConcernError = r.WriteConcernError |
| 600 | if sess != nil && sess.RetryWrite { |
| 601 | sess.TxnNumber = txnNumber |
| 602 | return conv, batches, nil // report writeconcernerror for retry |
| 603 | } |
| 604 | } |
| 605 | |
| 606 | conv.N += r.N |
| 607 | |
| 608 | if !continueOnError && len(conv.WriteErrors) > 0 { |
| 609 | return conv, batches, nil |
| 610 | } |
| 611 | |
| 612 | res = conv |
| 613 | } |
| 614 | |
| 615 | // Increment txnNumber for each batch |
| 616 | if sess != nil && sess.RetryWrite { |
| 617 | sess.IncrementTxnNumber() |
| 618 | batches = batches[1:] // if batch encoded successfully, remove it from the slice |
| 619 | } |
| 620 | } |
| 621 | |
| 622 | if sess != nil && sess.RetryWrite { |
| 623 | // if retryable write succeeded, transaction number will be incremented one extra time, |
| 624 | // so we decrement it here |
| 625 | sess.TxnNumber-- |
| 626 | } |
| 627 | |
| 628 | return res, batches, nil |
| 629 | } |
| 630 | |
| 631 | // get the firstBatch, cursor ID, and namespace from a bson.Raw |
| 632 | func getCursorValues(result bson.Raw) ([]bson.RawValue, Namespace, int64, error) { |
| 633 | cur, err := result.LookupErr("cursor") |
| 634 | if err != nil { |
| 635 | return nil, Namespace{}, 0, err |
| 636 | } |
| 637 | if cur.Type != bson.TypeEmbeddedDocument { |
| 638 | return nil, Namespace{}, 0, fmt.Errorf("cursor should be an embedded document but it is a BSON %s", cur.Type) |
| 639 | } |
| 640 | |
| 641 | elems, err := cur.Document().Elements() |
| 642 | if err != nil { |
| 643 | return nil, Namespace{}, 0, err |
| 644 | } |
| 645 | |
| 646 | var ok bool |
| 647 | var arr bson.Raw |
| 648 | var namespace Namespace |
| 649 | var cursorID int64 |
| 650 | |
| 651 | for _, elem := range elems { |
| 652 | switch elem.Key() { |
| 653 | case "firstBatch": |
| 654 | arr, ok = elem.Value().ArrayOK() |
| 655 | if !ok { |
| 656 | return nil, Namespace{}, 0, fmt.Errorf("firstBatch should be an array but it is a BSON %s", elem.Value().Type) |
| 657 | } |
| 658 | if err != nil { |
| 659 | return nil, Namespace{}, 0, err |
| 660 | } |
| 661 | case "ns": |
| 662 | if elem.Value().Type != bson.TypeString { |
| 663 | return nil, Namespace{}, 0, fmt.Errorf("namespace should be a string but it is a BSON %s", elem.Value().Type) |
| 664 | } |
| 665 | namespace = ParseNamespace(elem.Value().StringValue()) |
| 666 | err = namespace.Validate() |
| 667 | if err != nil { |
| 668 | return nil, Namespace{}, 0, err |
| 669 | } |
| 670 | case "id": |
| 671 | cursorID, ok = elem.Value().Int64OK() |
| 672 | if !ok { |
| 673 | return nil, Namespace{}, 0, fmt.Errorf("id should be an int64 but it is a BSON %s", elem.Value().Type) |
| 674 | } |
| 675 | } |
| 676 | } |
| 677 | |
| 678 | vals, err := arr.Values() |
| 679 | if err != nil { |
| 680 | return nil, Namespace{}, 0, err |
| 681 | } |
| 682 | |
| 683 | return vals, namespace, cursorID, nil |
| 684 | } |
| 685 | |
| 686 | func getBatchSize(opts []bsonx.Elem) int32 { |
| 687 | for _, opt := range opts { |
| 688 | if opt.Key == "batchSize" { |
| 689 | return opt.Value.Int32() |
| 690 | } |
| 691 | } |
| 692 | |
| 693 | return 0 |
| 694 | } |
| 695 | |
| 696 | // ErrUnacknowledgedWrite is returned from functions that have an unacknowledged |
| 697 | // write concern. |
| 698 | var ErrUnacknowledgedWrite = errors.New("unacknowledged write") |
| 699 | |
| 700 | // WriteCommandKind is the type of command represented by a Write |
| 701 | type WriteCommandKind int8 |
| 702 | |
| 703 | // These constants represent the valid types of write commands. |
| 704 | const ( |
| 705 | InsertCommand WriteCommandKind = iota |
| 706 | UpdateCommand |
| 707 | DeleteCommand |
| 708 | ) |